4202221 has 4 divisors (see below), whose sum is σ = 4227552. Its totient is φ = 4176892.

The previous prime is 4202203. The next prime is 4202227. The reversal of 4202221 is 1222024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4202221 - 2¹⁵ = 4169453 is a prime.

It is a super-2 number, since 2×4202221² = 35317322665682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4202227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12415 + ... + 12748.

It is an arithmetic number, because the mean of its divisors is an integer number (1056888).

Almost surely, 2^4202221 is an apocalyptic number.

It is an amenable number.

4202221 is a deficient number, since it is larger than the sum of its proper divisors (25331).

4202221 is a wasteful number, since it uses less digits than its factorization.

4202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25330.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 4202221 is about 2049.9319500901. The cubic root of 4202221 is about 161.3712994720.

Adding to 4202221 its reverse (1222024), we get a palindrome (5424245).

The spelling of 4202221 in words is "four million, two hundred two thousand, two hundred twenty-one".